I had a guy ask me about repainting both rear quarter panels on a 1968 Ford Ranger pickup (yes a Ranger). Down the side is a raised section all the way down the center of it (I don't know the proper name for it). It is like a raised "V". Some models had trim on top of this raised section. This particular model has no trim. This section has a thin line of seam sealer above and below it and is cracked and some minor surface rust in places. What is it called and where can I buy some? Also how do I prep the area after the old sealer is replaced? Please forward any help and info.